[openstack]metadata service使用方法

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原文地址：http://blog.csdn.net/gtt116/

概述

为了兼容EC2，openstack也提供了在虚拟机内通过http://169.254.169.254来获取虚拟机信息的接口。以下是对该接口的介绍。

注意，以下命令是在虚拟机内部执行，不是在宿主机以及安装了Openstack的环境的虚拟机中运行。

基本使用方法

$ curl [http://169.254.169.254/openstack]2012-08-10latest

获取Openstack的虚拟机相关信息

$ curl [http://169.254.169.254/openstack/2012-08-10/meta_data.json]{"uuid": "d8e02d56-2648-49a3-bf97-6be8f1204f38", "availability_zone": "nova", "hostname": "test.novalocal", "launch_index": 0, "meta": {"priority": "low", "role": "webserver"}, "public_keys": {"mykey": "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAAAgQDYVEprvtYJXVOBN0XNKVVRNCRX6BlnNbI+USLGais1sUWPwtSg7z9K9vhbYAPUZcq8c/s5S9dg5vTHbsiyPCIDOKyeHba4MUJq8Oh5b2i71/3BISpyxTBH/uZDHdslW2a+SrPDCeuMMoss9NFhBdKtDkdG9zyi0ibmCP6yMdEX8Q== Generated by Nova\n"}, "name": "test"}

获取EC2的虚拟机相关信息

$ curl [http://169.254.169.254/1.0/meta-data]ami-idami-launch-indexami-manifest-pathhostnameinstance-idlocal-ipv4reservation-id$ curl [http://169.254.169.254/1.0/meta-data/ami-id]ami-0000005d

获取user-data

$ curl [http://169.254.169.254/2009-04-04/user-data]\#\!/bin/bashecho 'Extra user data here'

Havana新增接口

In havana you can get your vendor data from metadata server, then get the data by:

curl [http://169.254.169.254/openstack/2013-10-17/vendor_data.json]

2013-10-17 is the date of Havana release.In service side, add `vendordata_jsonfile_path=/etc/nova/vendordata.json` into nova.conf. then feed json content into vendordata.json. Then your client can get the data from above command.

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